<template>
  <div>
    <h3>这个son组件---nextTick---{{ num }}</h3>
    <!-- <button @click="hUpdate">同步修改</button> -->
  </div>
</template>

<script>

export default {
  // props接受值是异步的
  props: {
    num: {
      type: Number,
      required: true
    }

  },
  methods: {
    hUpdate() {
      console.log('update')
    }
  }
}
</script>

